Guys, I've had the 3rd standard PEA in place for a while now. After buying the first, I was able to pick up a couple used from guys that found they could get by with one. This allowed me to get a pretty good feel for the benefit each additional PEA brought.
The first was installed on top of my AM Mini Ref, which also places it between the Coincident CSL power supply and preamp proper. After being in place about an hour, it was obvious the PEA wasn't going anywhere and I would do well to think about adding more. Especially given that this 1st PEA was on the middle shelf of my Maplehsade (4" thick maple shelves) rack, which I expect renders that PEA of no use to pieces located on the top and bottom shelves.
Addition of the second PEA found its best placement on top of one of my Cary mono blocks, which are placed between my Magnepan 3.7Rs. I moved them around a bit and back and forth from one monoblock to the other. Finally, I found that on top of the one of the Carys right above the input board gave maximum benefit. Overall, the benefit associated with adding the 2nd PEA was certainly noticeable but not quite at the level I saw in adding the first PEA.
The opportunity to pick up a 3rd PEA came along, so I figured it would make sense to locate another one above the input on the other mono block. Surprisingly, addition of this 3rd PEA resulted in a huge improvement--OMG level. I was expecting diminishing returns on addition of the 3rd one. What I got was just stunning beauty. Smooth, rich, clear, sweet, detailed, airy, dynamic, you name it I've got it at a substantially improved level. Now all I need is more time to listen.
The bottom line here is what I have said previously. These things are for real. They can be the last piece in bringing it all together and making things right. Well done Jerry!